Interesting question you pose here. The likely reason why your babies have
a "teal" color is because they are not seagreens like their father. These
babies are probably either blues or white-face blues, depending on what
color the mother bird is. I know you said she was cinnamon, but that
cinnamon color is in addition to another color: either green, blue,
seagreen, or white-face blue. Knowing what her base color is will help
determine what color the babies actually are.
The ALBS picture library is a great resource for finding photos of the
different mutations. Clicking on the following link will take you there.
Scroll down to "Blue -- Peachfaced" and click on the album to open it up.
You'll see different photos of blues, white-face blues, and seagreens in
there. This might help you identify what color your babies are.
There's also a description written on the ALBS site about the differences
between blue, white-face blue, and seagreen. This might give you a better
understanding of the genetics behind these colors and how you managed to
produce the colors that you got with the pair that you have. While your
female is visually cinnamon and you can't look at her body color to tell you
which color blue she is, the other descriptive traits still apply (face and
beak coloration), so this can help you determine what the base color of the
female is, which will in turn help you figure out what color the babies are.
Hope some of this information is helpful to you! Good luck with the babies.
Whatever color they are, I'm sure they are absolutely darling, as all baby
lovies are. Oh, and btw, the body color will not change. What you see
coming out on the wings and belly area is the body color the lovebird will
keep through adulthood. The only colors that change on lovebirds as they
get older are the colors of their faces and the amount of yellow in pied
lovebirds. Otherwise, what you see is what you get!